Transmitter for cables



I1 I.. RDGEHS. TRANSMITTER Fofa CABLES,

APPLICATION FILED IIEAYS, i919.

Mmmm Iam 259 192i.,

2 SHEETS-SHEET l-Y F. L. ROGERS. TRANSMITTER FOR CABLES. APPLlcATIoNFILED vMM( 5, 1919.

Patented Jan. 25, 1921.

2 SHEETS-SHEET 2.

Application filed May 5, i919.

trni'isinission instruments, mil wherein means iro employed tor"einlering the ait-tion nl the parts. quien, oortnin :ind 'l'ree ot lostmotion.

An important l'entnre ol' the invention ire sides in tho provision ot'nier-.n wherein t nnsniission ol sig-nails will be s 'isl'netorilyellen-.toil with :in inere-.ise in the r: .ie olf pro@- ress anni withgreater legibilitfif ot the signals, und in oriler to zireoniphsh thisno pose l han' i Lmitl pnrlirnlnr ree-:nil to the :irrnngenient olf theyeontne: levers unil 'the einbotliment therewith ol' n nierhnnisniwherein said, ontzet leversy will be quickly and positivelir operntmlupon to :inlomntie: ll),Y nmlie und brezil: the eontnets in thetransmission oit' elcetrie. impulses nml l. have l'nrlher asesoointetlas zin oilierutive combination. parts which :iro eopnble ol eonvenient:nljnstinent without alisnblinzgg 'the 'nstrnnient shonlil the (levieoneed attention through the, inet olz ntrnosplierio in'llnei'nfes or thonotion lolZ vihrntions.

Another ohjeet ot the invention resides in the provision ot rontniilevers :intl :in :netnnting rneelninisni for said levers which willconsist principally ol' .1 ilriver shntt on which :i singin anni islined nml provitleill with one ornny preferred ninnber ot workingsnrtnees whieh nre adapted lo Abe pio sented :it one :unl thesznne time.:ig-:inist the levers to respectively pei-init ot' movements oi the pinsrelatively ot the ribbon while nllowing` i'or operative eoi'itufftiiirqvof the levers :is the ribbon progresses.

Another object, of tho invention resitles in the provision ot ntnnsinitor -which will consist ot :i .finir or st.: r 1wh l i'or'fouling the Doritornteil ribbon in the .'esenee ol: tho pins of thoeontziet nrn'ie., ing` ther;`A with n driver shavlt. lim' n simple goortrain for driving snitl spur or stair wheel; providing; the, drivershzi'lt with :i einn i )firm vidio?,` Contact timing hmnrh 2mn@ matingwith tho cam to be siinnltz'nieoi Specification of Letters Patent.

Pn'tonted Jam. 25. l92lt.

operated upon thereby, and so arranging the s:- i n sitio vien' ot theinstrument. is n pino vien' thereof with parts is :i section on line 3-3ot' Fig. 2. i tion on lino Lit-Li ot 2. 'hir-11 l desire to particularlyze nre nur .linnn simplicity o t coni, unil eli'i'ninzition ot certainWell nini-vn i: rtssneli ns ivhnt nro known in the :lr wn king-twainineelmnisins for actuating-'the eontnet levers. intl otherwiso re-nrrnjthe imi-t "o :is to nnvterinlly reduce l nion nini l'rietion :unltherebyr permit he trains-n sion ot eleetrie in pulses with inh measureot' rapidity innl leg'ibility. ,her 'lfentnrn to which l zittznhimpornnxe is toe. nrrlnie'einent ot o simplified coini i ot' .vorli'ingparts which will operate i the instrument in adjustment under ordine. veoinlitions :intl .vet permit of convenient nmnipnlntion olt the partsWithout the neven; 'ty ot disabling` the instrument.

carrying the invention into practice, l n'nnle ol' o eronntl contact.lover and the rsnnl buttery unl line eonnet levers (i T All of Vtheselevers :ire mounted to Yc nylon n snpportine' slinlt :init euch isprovided with n nietnllie snr'l'nee or pin 9,

strn

(Vli

:wanted to eo'nrt 'with nn inljnstnblo Contact lli-:inclini oi The. longbronches l2 oi' tho eontnet. levers '(3 and 'I nre provided with theyusual Vertical pinslf3 which exteinl in un npi 'orddirection throngh nnopening; 14 in tho will l5 of 2L easing structure 1G. These pinsiii-.ite with tho roller 1T and the lutter co-ncts in the nsnnl innnnerwith the star leofl vfheel 1S, by menos ot whirh Ythe nsnnl pertorntedribbon ntlziptell to bo enrriefl zit-ross tho opening'g peetive eontnrtsnt internmtter explained. lThe pins :it t9 to the 'tree terininnls of l'ot' the. eontziet levers 5 and 7 und sin ins :1re yioltlnigly helcl:i'glilnst Stop sert. s mi.) by :me-:nis oit' springs 2l. The

upper extremities of the pins are free to tilt in bifurcations 22 in abracket Q3 secured to the to'p wall 15. This arrangement is preferred inorder to always maintain a uniform. te ticalsalinement of the workingends of the pins with respect to the perforations at the sides of thecenter of the ribbon. The star feed wheel is of course adapted to engagein the central perforations of the ribbon.

A driver shaft 24. is journaled in antifriction bearings 25u25 in thevertical walls 26-E26 of the easing 6. rillhis driver shaft is adaptedto be directly driven by a suitable motor which may be connected withthe terminal 27 of the shaft. In lieu thereof, however, the driver shaftcan be provided with a friction disk 28 of the usual well known type.Said driver shaft is provided with a conical extension 29 on which a cam30 is mounted, the bore 3l' of the cam being formed with due regard t0the conical por tion 29 so as to permit friction to be induced betweenthe parts and thus eliminate lost motion when the cam is revolved. Ascrew 3l on the shaft E24 eo-acts with the cam so that on adjustment ofthe screw the cam will be. moved in wedge-like contact with the conicalsurface 29 to establish the desirable binding action as stated.

This cam in the present instance is of rec tangular configuration. Ithas equally proportioned sides and at the vertices of the sides it isprovided with uniform continuous working surfaces 39.. In addition tosaid surfaces the cam is provided with flat sides or surfaces 33, thelatter being also of uniform and continuousl formation. This cam has alength exceeding the span across all of the respective contact levers 5,6 and 7 so that said levers will be simultaneously operated when the camis in motion. The construction of the instrument wherein I haveeliminated man;7 working parts heretofore employed, is responsible for amore perfect transmission of signals whenever interruptions in the cableknown as induetion, slight earth currents, lightning, bad balancingofthe cable etc., occur to which the cable is subjected.

The faces 33 being nearer to the axis of the cam will of course permitthe requisite freedom of the contact arms whereby the pinsl 13 willoperatively enter the perforations in the ribbon as the latterprogresses. ,The corner faces 32 being farther away from theaxis of thecam permit the contact leversto freely more to their open circuitpositions as will be understood.

Bearing in mind that it is simplicity of constrdction primarily that lhave brought about wi h resulting advantages and higherefiicieniyll1llvish now to describe the means for transmittingmotionfrom the driver shaft I24: to'the star feed wheel 18, and in messes thisconnection l have also endeavored to bring about a combination ofinstrumentalities which will eliminate lost motion and thereby permit ofgreater legibility in the transmission of electric impulses. To 'thisend the transmittin'g` mechanism consists of a shaft 34 having a conicalportion 35 on which the star feed wheel 18 is mounted, the bore of thelatter following` the configuration of the portion so that a bindingaction between the respective parts can be ef fected by moving the wheelendwise of the axis of the shaft 34;. A' screw 3G on the shaft 34Cprovides means whereby its adjustment can be operatively established.rThe j shaft gli is provided with a fixed gear wheel 37 arranged in meshwith a small driving pinion 88 on the driver shaft 24. in this mannerthe desired balance of parts is established and the highest measure ofefficiency has been found to present itself from the arrangement spe'iticd.

The ground contact levcr is so constructed as to render the sameadjustable in order to provide a longer or shorter period of envgagement betweei'i'said lever and the mating contacts 6 and 7. thelatter functioning directly into the cable; either positive or negativecurrent as the case may be. For illusv tration, it is assumed that theearthing contact is closed so as to not operate from the cam BO. Thiseffect on the two adjacent eon tarts of the lever t3 and i' would act asa direct and full period engagement from either one of said levers whichmight be in active ojieration and would, in most cases, result in toolong a period, causing the signal transmitted to appear too heavy ormuddy. rthis movable contact lever 5 thus acts in conj unc tion with'the adjustable contact screw l0 to overcome this objection. By merelyopening or closing said carthing contact, it accurately governs theperiod of time ol' its two adjacent levers t3 and T. rllhc arrangelnientprovides positive means for regulating the period of time the current isallowed toiiiow into the cable, either positive or negative, as stated'and resulting in a heavier or lighter transmission as may be suitableto create toe highest measure of efliciency and accuracy of theinstrument.

The terms earthing contact lever7 and ground contact lever as used inthis description and in the appended claims do not have the commonmeaning that the lever iscoimectcd to the ground oigearth so that theelectricity may pass off to-thc ground, but have the specific meaningwell knoivn and familial' to all skilled in the use of transmitters forcables, vizi. 'a 'separate contact whichacts in conjunction ,'fwitheither the dot or dhsh contact for ctnnp'leting the circuit. 'i I lVhatis claimed as new is l. ln an automatic telegraphic transmitter lill Vagainst their contacts, means Lacasse the combination with theperforated ribbon actuating devices, of battery and line levers carryingtransmitting pins eo-acting With the perforations in the ribbon,contacts coactng with said levers, an earthinglever, a cam common to allof said levers for lifting the same from their co-acting contacts andfor releasing the pins from the perforations, means for yieldinglyadvancing said levers against their contacts, and means for shifting theengaging position of the earthing lever relatively to the cam so as toaffect the interval of engagement of the battery and line levers withtheir co-acting contacts and serving to regulate the length of time'thecurrent is permitted to flow into the cable from said battery and linelevers.

2. ln an' automatic telegraph transmitter, the combination with theperforated ribbon actuating devices, of battery and line levers carryingtransmitting pins, co-acting with the perforations in the ribbon,contacts co acting with said levers, an earthing lever, a cam common toall of said levers for lifting the same from their co-acting contactsand for releasing the pins from the perforations, means for yieldinglyadvancing said levers for shifting the of the earthing lever relatoatfectthe interval of engagement of the battery and line levers withtheir co-acting contacts and serving to engaging position tively to thecam so as regulate the length of time the current 1s permitted to flowinto the cable from said battery and line levers, and means acting as acommon support for all of said levers.

3. In an automatic telegraph transmitter the combination with theperforated ribbon actuating' devices, of battery and line leverscarrying transmitting pins co-acting with the perforations in theribbon, contacts coacting with said levers, an earthing lever, a camcommon to all of said levers for lifting the same from their co-actingcontacts and for releasing the pins from the perforations, means foryieldingly advancing saidlevers against their contacts, and means forshifting the engaging position of lever relatively to the cam so as toaffect the interval of engagement of the battery and line levers withtheir co-acting contacts and serving to regulate the length of time thecurrent is permitted to flow into the cable from said battery and linelevers, an actuating shaft for the cam, the said cam having a socketreceiving one end of the shaft, and means for' moving the cam endwise onthe shaft and for securing the same to the shaft.

4:. ln an automatic telegraph transmitter, the combination with theperforated ribbon actuating devices. of battery and line levers.carrying transmitting pins co-acting with the perfor-ations in theribbon, contacts c0- acting with said levers, an earthing lever, acontact co-acting with the carthing lever and adjustable vertical withrespect thereto, a support common to all of said levers, an ac tuatingshaft, and a cam carried by said shaft and acting as a commoncontrolling means for all of said levers. ln testimony whereof I haveaffixed my signature. y

FRED L. ROGERS.

the earthing

